Serena Williams of the U.S. reacts during her tennis match against Na Li of China on the second day of the WTA championship in Istanbul, Turkey, Wednesday, Oct. 24, 2012. (AP Photo)

Associated Press
Serena Williams of the U.S. reacts during her tennis match against Na Li of China on the second day of the WTA championship in Istanbul, Turkey, Wednesday, Oct. 24, 2012. (AP Photo)
Serena Williams of the U.S. reacts during her tennis match against Na Li of China on the second day of the WTA championship in Istanbul, Turkey, Wednesday, Oct. 24, 2012. (AP Photo)
View Comments